From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-0.3 required=5.0 tests=BAYES_00,
	REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4
X-Google-Thread: a07f3367d7,15d78a51b0d35cec
X-Google-Attributes: gida07f3367d7,public,usenet
X-Google-NewGroupId: yes
X-Google-Language: ENGLISH,ASCII
Path: 
 g2news2.google.com!news4.google.com!feeder.news-service.com!feeder.news-service.com!tudelft.nl!txtfeed1.tudelft.nl!multikabel.net!newsfeed10.multikabel.net!feeder3.cambriumusenet.nl!feed.tweaknews.nl!195.14.215.230.MISMATCH!news.netcologne.de!newsfeed-hp2.netcologne.de!newsfeed.arcor.de!newsspool1.arcor-online.net!news.arcor.de.POSTED!not-for-mail
From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: architecture-independent GNAT project files?
Newsgroups: comp.lang.ada
User-Agent: 40tude_Dialog/2.0.15.1
MIME-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: 8bit
Reply-To: mailbox@dmitry-kazakov.de
Organization: cbb software GmbH
References: <75l5ceF18samiU1@mid.individual.net>
Date: Mon, 27 Apr 2009 10:02:13 +0200
Message-ID: <t61uka9cd012.18ciieoylrlrx$.dlg@40tude.net>
NNTP-Posting-Date: 27 Apr 2009 10:02:13 CEST
NNTP-Posting-Host: c370ed50.newsspool2.arcor-online.net
X-Trace: 
 DXC=BIi`kU6_U3H78PK[oJ2ng@A9EHlD;3YcB4Fo<]lROoRA^YC2XCjHcbI^3QAZeYME[HDNcfSJ;bb[EFCTGGVUmh?DLK[5LiR>kgBH:Vb`K4>i8O
X-Complaints-To: usenet-abuse@arcor.de
Xref: g2news2.google.com comp.lang.ada:5549
Date: 2009-04-27T10:02:13+02:00
List-Id: <comp.lang.ada>

On Mon, 27 Apr 2009 09:32:29 +0200, Bj�rn Persson wrote:

> When I write GNAT project files for shared libraries I find that I have to
> hardcode the paths to some architecture-specific directories. 32-bit
> libraries are in /usr/lib/ while 64-bit libraries are in /usr/lib64/, and I
> would like to have a single project file that works for both cases.

The way I am using is to have a platform variable in the project file:

   type Platform_Type is ("x86_Windows", "x86_VxWorks");
   Platform : Platform_Type := external ("Platform", "x86_Windows");

and then somewhere later

   case Platform is
      when "x86_Windows" =>
         for Source_Dirs use "os/Windows/i586" & ...;
      when "x86_VxWorks" =>
         for Source_Dirs use "os/vxworks/i586" & ...;
   end case;

then same for library things etc.

> The way to find out the architecture of a Unix-like system appears to be to
> invoke uname, but GNAT project files don't seem to have a shell-out
> feature. As far as I can see in the manual the only ways they can get input
> is by environment variables and command line parameters. I don't suppose
> Gnatmake provides some variable to project files that shows what the
> architecture is?

I don't know if it has, but if any, how that is supposed to work for cross
platform developing?

> Does anyone have a better idea?

I would like to hear it too, because the solution I am using is a bit
obtrusive.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de